<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2009, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * CodeIgniter Security Helpers
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/helpers/security_helper.html
 */

// ------------------------------------------------------------------------

/**
 * XSS Filtering
 *
 * @access	public
 * @param	string
 * @param	bool	whether or not the content is an image file
 * @return	string
 */
if ( ! function_exists('xss_clean')) {
  function xss_clean($str, $is_image = FALSE) {
    $CI =& get_instance();
    return $CI->input->xss_clean($str, $is_image);
  }
}

// --------------------------------------------------------------------

/**
 * Hash encode a string
 *
 * @access	public
 * @param	string
 * @return	string
 */
if ( ! function_exists('dohash')) {
  function dohash($str, $type = 'sha1') {
    if ($type == 'sha1') {
      if ( ! function_exists('sha1')) {
        if ( ! function_exists('mhash')) {
          require_once(BASEPATH.'libraries/Sha1'.EXT);
          $SH = new CI_SHA;
          return $SH->generate($str);
        }
        else {
          return bin2hex(mhash(MHASH_SHA1, $str));
        }
      }
      else {
        return sha1($str);
      }
    }
    else {
      return md5($str);
    }
  }
}

// ------------------------------------------------------------------------

/**
 * Strip Image Tags
 *
 * @access	public
 * @param	string
 * @return	string
 */
if ( ! function_exists('strip_image_tags')) {
  function strip_image_tags($str) {
    $str = preg_replace("#<img\s+.*?src\s*=\s*[\"'](.+?)[\"'].*?\>#", "\\1", $str);
    $str = preg_replace("#<img\s+.*?src\s*=\s*(.+?).*?\>#", "\\1", $str);

    return $str;
  }
}

// ------------------------------------------------------------------------

/**
 * Convert PHP tags to entities
 *
 * @access	public
 * @param	string
 * @return	string
 */
if ( ! function_exists('encode_php_tags')) {
  function encode_php_tags($str) {
    return str_replace(array('<?php', '<?PHP', '<?', '?>'),  array('&lt;?php', '&lt;?PHP', '&lt;?', '?&gt;'), $str);
  }
}


/* End of file security_helper.php */
/* Location: ./system/helpers/security_helper.php */